These are 4, 8 and 12 port hub protectors that support 100BASE-TX and 10BASE-T Ethernet, RS422, RS423, RS485 using RJ45 with all 8 wires protected.
SP530A-R2 is a 4-port hub protector that supports 100BASE-TX and 10BASE-T Ethernet, RS422, RS423, RS485 using RJ45 with all 8 wires protected.
SP531A-R2 is an 8-port hub protector that supports 100BASE-TX and 10BASE-T Ethernet, RS422, RS423, RS485 using RJ45 with all 8 wires protected.
SP532A-R2 is a 12-port hub protector that supports 100BASE-TX and 10BASE-T Ethernet, RS422, RS423, RS485 using RJ45 with all 8 wires protected.